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The quantitative determination of selected dyestuff components by high .performance liquid chromatography, diode-array detection and post-run data manipulation was used to recognize dyes on historic yarns prepared from Dactylopius coccus(American cochineal), Kermes vermilio (kermes),Porphyrophora polonica (Polish cochineal), Porphyrophorahamelii (Ararat cochineal) or Kerria lacca(Indian lac). Study of scale-insect red dyes suggests a rather widespread use of mixed primary sources, notonly of insect reds alone but also in combination withplant reds and tannins.
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Wouters et al. (1989) studied this question.
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